Electromagnetic carbon-pile regulators



March 31, 1959 A. STAMBERGER 2,880,294

ELECTROMAGNETIC CARBON-FILE REGULATORS Filed Oct. 22, 1956 2Sheets-Sheet 1 March 31, 1959 A. STAMBERGER 2,880,294

ELECTROMAGNETIC CARBON-FILE REGULATORS Filed Oct. 22, 1956 2Sheets-Sheet 2 ELECTROMAGNETIC CAR BDl W-PIIl E REGULATORS AndrewStamberger, BrocltleynLondom d, assign Englan or to J. Stone&'Company'(Dept ford) LlmltedfDeptford, London, England ApplicationOctober 22, 1956, Serial No. may I 7Clalms'. client-a1 This inventionconcerns improvements relating to totally enclosed, sealed,electromagnetic carbon-pile regulators.

In accordance with the invention one or more ballast resistors used inconjunction with a regulator are sealed into a regulator enclosure orinto an enclosure in sealed communication therewith. This arrangementnot only enables compactness and effective cooling and control oftemperature rise to be achieved, but also ensures that all live partsare enclosed in water-tight manner and that good protection againstcorrosion is obtained. Furthermore, it permits of the use of convenientterminal sealing means.

The enclosure for the resistors may suitably be arranged either besidean enclosure for the magnet system of the regulator or at the end,remote from the latter enclosure, of an enclosure for the carbon pile ofthe regulator.

Two embodiments of the invention by way of example will now be morefully described with reference to the accompanying drawings. Theseembodiments are applied to electromagnetic carbon-pile regulators whichare generally of the construction described in the specification ofapplication Serial No. 399,794, now Patent No. 2,828,395.

In the drawings:

Figure 1 is a side elevation of one embodiment of the invention asapplied to such a regulator,

Figure 2' an axial section to a larger scale through a part of theregulator shown in Figure 1, and

Figure 3 a side elevation of the second embodiment.

Referring to Figures 1 and 2, the magnet system of the regulator, whichis not shown but is of the kind described and illustrated in theaforesaid specification, is enclosed in a can 1 having a domed cover 2and the pile 3 is mounted inside a ceramic tube 4 enclosed in a metaltube 5, also as described in the said specification. The end of the tube5 at which the fixed abutment 6 for the pile 3 is located is attached toa transverse plate 7 carry ing a cylindrical extension 8, with a ceramicliner 9, of larger diameter. Cooling fins 10 (Figure l) are pressed overboth the tube 5 and the extension 8, which may be slightly tapered tofacilitate this. The fins are dimensioned and spaced to keep thesurface-temperature rise within a predetermined limit. The ballastresistor or resistors 11 connected in the usual manner to a winding orwindings of the electromagnetic regulator are wound on a ceramic tube 12received within the liner 9. To ensure close contact between the liner 9and resistors 11, so as to reduce the temperature rise of the latter,and also to avoid detrimental vibration elfects, the liner 9 and tube 12are tapered on the inside and outside respectively.

The end of the extension 8 remote from the can 1 and the magnet systemis closed by a plate 13 which is dished inwardly for stiifness and ismade of thin material having low thermal conductivity, so as to reducethe conduction of heat from the said extension to a terminal-seal2,880,294 Ice Patented Man-31,1959

unit 14 supported by the said plate at-its middle and tolimititemperature rise of the seals in operation. The plate may also beshaped, for example circumferentially :channeled as indicated at 15 inbroken lines, to increase 5 the length of the heat-conducting path tothe seals. Al-

ternatively, to reduce the temperature rise of the seals, the seal unitmay be mounted at the remote end of a further cylindrical-memberextending outwardly from the plate 13. Interengaging formations at 16 inthe plate 13 and ceramic tube 12 prevents relative rotation.

, "The seal unit may be a multiple hermetic seal assembly designed tomate with a weather-proof connector socket indicated in chain outlinetat-1,4 in Figure .1. One .Zot'the terminals 17 is connectedtothefixed-pile abut- -;ment-6. g5 Leads, notshown,trom-othersrofthe saidterminals 17 to the movable pile abutment 6 andjto the magnet system arecarried through a duct 18, lined by a ceramic tube 19, which extendsparallel to the pile 3 and communicates between the interior of theextension 8 and the interior of the magnet-enclosure can 1, its endsbeing connected to the transverse plate 7 and to the cover 2respectively. An outwardly projecting thrust ring 20 fixed to the outeredge of the extension 8 is rigidly connected to the magnet system by aplurality of tie rods 21. These rods pass through seals in the cover 2and one rod 21 or more may be adjustable in length, as described in theaforesaid specification.

After insertion of the ceramic tube 4 containing the pile 3 in the metaltube 5, the fixed pile-abutment assembly is secured to the latter tubeby a nut 22. The remote end of the ceramic tube 4 is located by aceramic ring 23 from which a thin tubular extension 24 reaches to, andis sealed into, the cover 2 of the magnet-enclosure 1. The arrangementsfor applying pressure to the movable abutment 6' and for makingelectrical connection therewith may be of the kind described in theaforesaid specification.

This embodiment achieves a compact arrangement, is easy to assemble andconnect up and provides a unit which is symmetrical about its centreline, thereby facilitating flexible mounting of the regulator.

In the embodiment of Figure 3, a unit comprising the ballast resistor orresistors wound on a tube of insulating material and having aninsulating sleeve slipped over them is mounted in a tubular enclosure 25which is provided with cooling fins 26 on the outside. As shown, thetubular enclosure 25 may be located parallel to and close beside themagnet-enclosure can 1 to which it is rigidly secured, with a spacingblock 27 between them, by means of a strap 28. The interior of thetubular enclosure 25 is connected by a U-shaped duct 29 to the outer endof the tubular, finned, pile enclosure 5, whilst a branch 30 from thesaid duct 29 carries the leads through the domed cover 2. Terminalseals, for example a multiple hermeticseal assembly 31 mating with aweather-proof socket, are provided at the other end of the enclosure 25.

With the above-described arrangements, terminal seals need not bemounted on the cover 2 of the magnet enclosure 1. This is important forhigh-temperature conditions of operation which require the joint betweenthe said enclosure and its cover to be silver-soldered or welded. Theuse of a multiple terminal seal avoids difiiculties associated with thedisposition of the terminal seals in other positions.

If necessary, provision may be made for cooling of both the pile and theballast resistors by a circulating liquid coolant. Arrangements inaccordance with the invention lend themselves particularly convenientlyto such cooling.

I claim:

1. A totally enclosed, sealed, electromagnetic carbonpile regulator,wherein at least one ballast resistor used in conjunction with theregulator is sealed by walls into 3 an -enclosed space in sealedcommunication with, but spaced away tronn'a spaced enclosed by walls andcontaining the magnet system of the regulator.

2. A regulator as claimed in claim 1, wherein an en- "closure containing"at least the one ballast resistor is arranged beside thewalls formingthe enclosure containing the magnetsystem :of the regulator.

3. A regulator as claimed in claim 1, wherein walls providing anenclosure containing at least the one ballast resistor'are' arranged atthe end, remote from the enclosure; containing the magnet system of theregulator, 'of the enclosure containing the carbon pile ofthe'r'e'gulator. Y P

4. A regulator as claimed in claim 1, wherein at least i t'he oneballast resistoris wound on one and-received within another-hollowmember of insulating material.

5. A regulator as elaim'ed in claim 1 wherein at least the one ballastiresistor-is wound on one and received within anotherzchollow -:memberof in ulating ceramic material.

6. A regulator as claimed in claim 1, wherein a wall "i'formingpart-uf'th'e enclosure containing the "one ballast References Cited inthe'file ofthispatent UNITED STATES PATENTS 2,393,952 a en T Feb. 5,1946 2,4 54,671 Roberts Nov. 23, 1948 ornate REFERENCES Butler:Therm'istors, Radio News, January 1948, pages 49, 154, 1'55.

